Relay coil former for a flat-type relay

ABSTRACT

In order to simplify the production of electromagnetic flat-type relays a separately manufactured relay coil former is slotted along one edge so that the flat magnet core can be inserted from the side and snapped into its position in the coil former.

United States Patent Collin et al.

[54] RELAY COIL FORMER FOR A FLAT- TYPE RELAY [72] Inventors: Rolf Henrik Collin, Segeltorp; Arne Rudolf Kjallstrom, Hagersten; Rune Nils Anders Thysk, Alvsjo, all of Sweden [73] Assignee: Teleionaktiebolaget LM Ericsson,

Stockholm, Sweden [22] Filed: Dec. 17, 1970 [21] Appl. No.: 99,134

[30] Foreign Application Priority Data Feb. 23, 1970 Sweden ..2238/70 [52] US. Cl. ..335/276, 335/296, 336/198 [51] Int. Cl. ..H0lf 7/08 [58] Field of Search ..335/209, 276, 296; 336/198, 336/208 1 Sept. 26, 1972 [56] References Cited UNITED STATES PATENTS 3,218,592 11/1965 Barrick ..336/198 3,358,256 12/1967 Naito et a1. ..336/208 X 2,425,155 8/1947 Jarvis ..336/208 X 1,858,562 5/1932 Schedlbauer ..335/276 X Primary Examiner-George Harris Attorneyl-lane, Baxley & Spiecens [5 7] ABSTRACT In order to simplify the production of electromagnetic flat-type relays a separately manufactured relay coil former is slotted along one edge so that the flat magnet core can be inserted from the side and snapped into its position in the coil former.

2 Claims, 4 Drawing Figures P'A'TiNTE'flsirzs m2 I 3.694.783

INVENTORS ReLrHiwrm: Comm ARNE RUDOLI KJH Ls-u-ASM Ruu: Nus ANDE as THYSK fl ORNEVS RELAY con. FORMER FOR A FLAT-TYPE RELAY The invention refers to a relay coil former of insulating material for a flat-type relay wherein the coil former is cast in one piece. The magnet core of such a relay has until now either been baked in as a part of the coil former or has been pushed along its axial direction into a coil former which has been cast separately. However, to bake in the magnet core is expensive and to push in the magnet core into the ready coil former in the above manner is for most flat-type relays not possible as the flat magnet core often has wider end parts in order to produce less magnetic resistance (reluctance) atthe air gaps between the magnet core and the armature. For this reason it was heretofore necessary in many cases to use loose gables and additional insulation between these and the coil and between the coil and the magnet core. This complication is avoided by making the coil former in one piece as is indicated in the appended claims. An advantage to such construction is the possibility of replacing the common residual plate by a tongue which is cast together with one of the gables. I The invention will be described with reference to the accompanying drawing wherein; Y

' FIG. l shows an example of a flat-type relay for a jack strip in a telephone exchange, having a coil former cast in one piece, which is shown separately in FIG. 2 seen from the side, in

FIG. 3 seen from the left end and in FIG. 4 in section seen from the left end. 1

In FIG. 1 the flat-type relay is seen from the side, so

that the flat magnet core 1 is seen from one of theedges. From 4 which shows a cross-section through the coil former which is to enclose the magnet core tightly, the thickness and the width of the magnet core inside the coil is evident. A coil 2 is wound on a coil former having rims 4 and 5. On the rim 5 there is integrally cost a tongue 7. Tongue 7 has such a thickness and is so arranged that it forms a residual plate between the armature 3 of the relay and the end of the magnet core I. The armature is in a known manner pivoted on the other end of the core on a fulcrum 16. Armature 3 is held with pins and a spring arrangement which presses the armature against the magnet core and simultaneously lifts the armature when the relay is not operated. The two end parts of the magnet core which co-operate with the armature, have the same width as bent down, is held in a put up (inactive) position as long as the armature3 is not attracted, the two contact springs 11 being kept apart by an arm of the visual in-, dicator. When the armature is released, the visual indicator will fall down and another arm on the same prevents the inserting of the plug, whereby simultaneously contact is obtained between the springs 11. The

springs 11 and 13 are connected with soldering tags 14 placed in a part 9 which is cast in one piece with the coil former 4,5,6 as is shown in FIG. 2 where 6 indicates the intermediate part of the coil former shown in section in FIG. 4. FIG. 3 shows how the holding of a e o ptf h a fi es o p hg oi l t ofig s a slot 8 as is apparent by FIGS. 2, 3 and 4, in one plane through one of the edges of the intermediate part 6 and through rims 4 and 5. The slot is suitably a little more narrow than the thickness of the magnet core. The magnet core is placed in the coil former by inserting it from the side after the slot 8 has been spread, which is possible if the coil former is manufactured from a material which is a little resilient, for example nylon. When the magnet core has come into its correct position in the coil former, the slot8 is released to its normal width and the magnet core is retained in the coil former.

We claim 1. An electromagnetic flat-type relay comprising a flat iron core having ends which are wider than its central part, an armature arranged substantially parallel to said central part, a coil former having an intermediate part and two rims, said coil former being cast in one piece from a resilient insulating material and being provided with a slot in one plane through one of the edges of the intermediate part and through said rims, said slot being narrower than the thickness of the central part of said core and said central part being inserted in the coil former from the side by temporarily spreading said slot, and an energizing coil wound upon said coil former.

2. An electromagnetic flat-type relay according to claim 1 further comprising a protruding tongue integrally cast with one of said rims for providing a residual plate between said core and said armature. 

1. An electromagnetic flat-type relay comprising a flat iron core having ends which are wider than its central part, an armature arranged substantially parallel to said central part, a coil former having an intermediate part and two rims, said coil former being cast in one piece from a resilient insulating material and being provided with a slot in one plane through one of the edges of the intermediate part and through said rims, said slot being narrower than the thickness of the central part of said core and said central part being inserted in the coil former from the side by temporarily spreading said slot, and an energizing coil wound upon said coil former.
 2. An electromagnetic flat-type relay according to claim 1 further comprising a protruding tongue integrally cast with one of said rims for providing a residual plate between said core and said armature. 